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Finding the Fourth Proportional to 399,639.29, 551,495.70 and 218,347.32

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Solution

The fourth proportional to 399,639.29, 551,495.70 and 218,347.32 is: 301,315.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    399,639.29 : 551,495.70 = 218,347.32 : x
  2. Step 2: Convert to fraction form
    399,639.29/551,495.70 = 218,347.32/x
  3. Step 3: Cross multiply
    399,639.29x = 551,495.70 × 218,347.32
  4. Step 4: Simplify right side
    399,639.29x = 120,417,608,086.52
  5. Step 5: Solve for x
    x = 120,417,608,086.52/399,639.29
  6. Step 6: Final answer
    x = 301,315.74

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.